ABRACON
芯片, 实时时钟, RC/晶振模式, 256B RAM, VBAT, 16QFN
芯片, 实时时钟, I2C, QFN-16
STMICROELECTRONICS
芯片, 实时时钟 带报警功能 I2C
NXP
芯片, 实时时钟
芯片, 实时时钟/日历, SPI, HVQFN-16
芯片, 实时时钟/日历, I2C/SPI, SOIC-16